Explanation: Explanation : (i) ECR pickup current = 108 mA/AC, 50Hz. (ii) ECR Drop away current = 72 mA/AC, 50Hz. (iii) This ECR withstands for a continuous current of 250 mA/AC 50Hz. (iv) Contact configuration: 4F-4B identically in A to D rows. (v) Voltage drop across R1 and R2 is less than 10V @ 125 mA/AC (normal working current). The important parameters of LED lamp proving relays:

Explanation: Explanation : The contractor shall be bound to carry out the work at the accepted rates up to the limit of in quantity of individual items of work. Up to +25% Variation 25% variation Explanation 25% of the original quantity : If the quantity of any item increases by up to , the contractor must execute it at the — no extra claim allowed.

Explanation: Explanation : previous LDCE ASTE question. The distance between the signal and the mast in front of it. Min.: 30 Mts.

Explanation: Explanation : Ensure when potential is applied across closed contacts. Relay Condition: Verify of contacts through multiple open/close cycles—there should be or welding. Energize the relay so . contacts are in the closed position After removal of voltage, the (indicating no welding occurred). Apply directly across the . Non‑Bridging Test Procedure 500 V DC Apply DC Voltage: Maintain voltage for at least . closed contact terminals Objective: 5 seconds contacts of AC/DC relays do not weld together Test Setup & Steps: clean operation no sticking

Explanation: Explanation : “ i. mother (including divorced mother); ii. unmarried or widowed sister; iii. brother/step‑brother under twenty one years… iv. invalid brother of any age…” not ‘Dependent relative’ in relation to a railway servant, whose father is alive, means:

Explanation: Explanation : It will be generally desirable to leave 25% or more conductors spare for all cables carrying 5 or more pairs of conductors for future expansions as codal life of these cables are very high.cable markers to be provided at every 50 meters.

Explanation: Explanation : Starter released by Advanced Starter shall be provided at Stations between Starter and Advanced Starter automatically replaced to ‘ON’ all diverging ends of junction stations, stations having twin single line block working, and stations without track circuiting between Starter and Advanced Starter. All signals, including Starters, must be after train passes. (b) Not required at with between Starter and Advanced Starter on . (a) Required at: wayside stations completed track circuiting single/double line (c) Diverging ends of junction stations Twin single line block working stations

Explanation: Explanation : used as track relay in RE area. meters track Circuit Lengths in RE Areas with Choke at the Relay end with high without choke at the Relay end with low traction return current of 600 amps. Usage: in 9 Ohms coil resistance with 2F/1B contact configuration. This relay requires more slug. New Installations: This can be used Upto 450 meters track Circuit Lengths in RE QTA2: Copper slug is provided on the core to achieve AC immunity. It's pick up voltage is 1.4v and pick up current is 140 ma approximately. QTA2 relays are available D.C. operating power and it take more time to pick up and drop due to the copper Areas with Choke at both ends. ii. Existing installations: This can be used Upto 450 traction return current of 1000 Amps and up to 350 meters track circuit length

Explanation: Explanation : nominate Tender Committee members General Managers of Zonal Railways The are empowered to from locally available project or divisional officers if necessary—to expedite meetings—.

Explanation: Explanation : Preparatory reset